Updated error message

app.py

@@ -43,13 +43,11 @@ def waveformer(audio, label_choices):
     # Read input audio
     fs, mixture = audio
     if fs != 44100:
-        raise ValueError(fs)
+        raise ValueError("Sampling rate must be 44100, but got %d" % fs)
     mixture = torch.from_numpy(
         mixture).unsqueeze(0).unsqueeze(0).to(torch.float) / (2.0 ** 15)
 
     # Construct the query vector
-    if len(label_choices) == 0:
-         raise ValueError(label_choices)
     query = torch.zeros(1, len(TARGETS))
     for t in label_choices:
         query[0, TARGETS.index(t)] = 1.
@@ -62,4 +60,4 @@ def waveformer(audio, label_choices):
 
 label_checkbox = gr.CheckboxGroup(choices=TARGETS)
 demo = gr.Interface(fn=waveformer, inputs=['audio', label_checkbox], outputs="audio")
-demo.launch()
+demo.launch(show_error=True)